Afonso, Josmary, et al. “Antibacterial Effect of Psidium Guajava L and Psidium Acutangulum Mart on Streptococcus Mutans”. Odontología Sanmarquina, vol. 21, no. 3, Sept. 2018, pp. 209-14, https://doi.org/10.15381/os.v21i3.15127.